Band-saw mill



kNo Model.)

W. M. WILKIN'. BAND SAW MILL.

Patented July 2, 1889.

N. PEYERS. PholvLlthvgmph:

\ 1* \IEOI' 3 3 i p E [Wenlorj UNITED STATES PATENT OFFICE.

IVILLIAM M. \VILKIN, OF ERIE, PENNSYLVANIA.

BAND-SAW MILL.

SPECIFICATION forming part of Letters Patent No. 406,323, dated July 2, 1889.

Application filed January 31, 1889. $erial No. 298,271. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM M. WILKIN, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Band-Saw Mills; and I do hereby declare the following to be a full,

clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to band-saw mills; and it consists in certain improvements in the construction of the same, as will be hereinafter fully set forth, and pointed out in the claims.

My invention is illustrated in the accompanying drawings, as follows:

Figure 1 is a vertical section on the line of the band-wheel shafts. Fig. 2 is a vertical section on the line 0c 03, which is at right angles to the band-wheel shafts.

The construction is as follows:

A A mark the upper frame-work of the mill, which is constructed as shown in an application for a patent now pending filed by me, and forms no part of the present invention.

B are vertically-movable posts, which move in the upright frame-posts A and rest on a cross-bar G.

C are vertically-movable caps, which set on top of the posts B.

D is the upper band-wheel shaft, which is "journaled in boxes E, which are pivoted on the caps O.

F are vertically-movable bars, which are contained within the posts 13, and are movable vertically with and also independently of said posts 13, so as to support the caps 0, while their lower ends rest on levers K, which are fulcrumed 011 knife-edges g on the bar G, the posts B being recessed at their lower ends to receive the ends of said levers K. The long ends of the levers K are connected with a weight-lever K by a link Zr.

II II are screws which set under the bar G, an d are operated by nuts II, which are turned by the worm-shaft M and worm-gear L, so as to move simultaneously, the screws H being held against turning by being chisel-formed at their upper ends. As the screws II II are operated, the bar G, posts B, levers K K, and

K, weight WV, bars F, caps 0, boxes E, and shaft D all move en masse vertically. As the levers K are moved, the bars F, caps (J, boxes E, and shaft D alone are moved vertically.

Of the last-named parts the levers K K and K and bars F are for giving tension to the saw, while the screws H, the worm-gearing by which the said screws are moved, and the posts B are for adjusting the upper bandwheel' P to the length of the saw.

It will be observed that the means for givingtension to the saw move independently-0f the means for adjusting the band-wheels to the saw, but are at the same time movable with the same, and also that all of these movable parts act independent of the frame-work, which is fixed.

The vertically -movable posts B, with the contained independ ently-movable bars F,constitute, in effect,extensible vertically-movable supports within the fixed frame-posts A for the upper band-wheel shaft, and the extensibility of these supports is regulated automatically.

I do not desire to be limited to the use of the levers and weights as the means for effecting the ten sional action of the extensible supports, as it is obvious that other well-known means for this purpose may be substituted.

NVhat I claim as new is 1. In a band-saw mill, the combination,with the fixed frame-work A A A, and the vertically-adjustable yoke G, contained Within the frame-work A, of automatically extensible supports for the upper band-wheel shaft contained with the frame-work A A and supported by said yoke.

2. In a band-saw mill, the combination, with the fixed frame-work A A, of the yoke orbar G, posts B, seated on said yoke, sliding caps O on said posts, boxesE on said caps, and screws H, for vertically moving said yoke or bar.

3. In a band-saw mill, the combin ation, with the fixed frame-work A A, of the yoke G, posts 13, seated on said yoke, sliding caps C on said posts, boxes E on said caps,bars F within said posts B and supporting said caps, levers K, fulcrumed on said yoke and supporting said bars F,weight-lever K, f ulcrumed on said yoke and connected with said levers K, and screws H, for Vertically moving said yoke.

4:. In aband-saw mill, the combination, with the hollow horizontal frame-piece A and the posts B, which rest on said bars F, and boxes hollow vertical frame-pieces A, of the yoke G, E, for the upper hand-wheel shaft, supported contained within the frame-piece A, the posts by said caps.

B, contained within the vertical fraine-pieces In testimony whereof I allix my signature in A and resting on said yoke, a liftingappapresence of two witnesses.

rat-us sn 3 )orted by said frame-piece A, which 7 T verticall y moves said yoke G and posts 13, WILLIAM \VILRD" scale-gearing supported on said yoke, vertical \Vitnesses:

bars F within said posts 1-), which are moved JNO. K. I'IALLOUK,

IO by said scale-gearing, slidingcaps O on said .TNO. L. CONDRON. 

